Quake II on Steam
store.steampowered.com
You are humanity’s last hope to stop the Strogg, a hostile alien race waging war against Earth. Play this military sci-fi FPS, now upgraded for modern platforms with improved visuals, new campaign content, online multiplayer/co-op, and more.

Massive nostalgia hit for this one. The update is crisp and smooth. Free update for current owners. Quake II 64 was relatively unknown and different to Quake II